Epoxy primer drying time

[MAC in TX]

I am painting my farmall H with PPG epoxy primer and top coating with PPG MAE with hardner. The spec sheet says to top coat within 72 hours but what is the minimum drying time required, 1/2 hour, 1 hour or longer.
Thanks for your help.

 

[CCWKen]

It should say right on the can. Or you can look it up on the PPG site. I don't shoot PPG so I don't know for sure but other epoxies can be coated within 30-60 minutes. As long as the tack is gone, you should be able over-coat. 72 hours seems like an long time for the max. Once cured, you generally have to sand the epoxy or the over coat won't stick very well. The stuff I shoot must be over-coated within eight hours.

 

[CNKS]

I don't have a spec sheet handy, but I have topcoated many times in about 30 minutes. Go to www.ppg.com -- you should be using those spec sheets anyway, there is a lot of info on them.

 

[CNKS]

Eight hours?? The PPG Omni epoxy window is 3 days at 70 degrees or you have to scuff and reapply. The higher price line of PPG is 7 days. The epoxy to topcoat or surfacer bond must be a chemical bond, not a mechanical one. The chemical bond gives better adhesion. That is why PPG says that if you exceed the window, you have to scuff and reapply the epoxy.

 

[PhilC]

If you are using Omni epoxy, dry time between coats is 15 minutes for one coat and 30 minutes for two. Those dry times are for [i:38dad510df][b:38dad510df]parts and paint[/b:38dad510df][/i:38dad510df] that are at 70 degrees, if the parts and paint are not at 70, the dry times will be longer.

Sounds like CCWKen is referring to an etch prime, not epoxy, with the maximum 8 hour recoat window.